CN1610773A

CN1610773A - Nonwoven webs having improved necking uniformity

Info

Publication number: CN1610773A
Application number: CNA028226143A
Authority: CN
Inventors: M·T·莫尔曼; C·J·莫雷尔
Original assignee: Kimberly Clark Worldwide Inc
Current assignee: Kimberly Clark Worldwide Inc; Kimberly Clark Corp
Priority date: 2001-11-28
Filing date: 2002-06-04
Publication date: 2005-04-27
Also published as: US6900147B2; WO2003046269A3; MXPA04004563A; BR0214157A; MXPA04004562A; US20030100238A1; KR20040058282A; JP2005536647A; ZA200403716B; EP1448825A2; WO2003046269A2; AU2002259334A1; AU2002259334B2; PL374258A1

Abstract

A neckable nonwoven web is provided with a central region and two edge regions, the central region being selectively easier to neck than the two edge regions. The nonwoven fibers in the central region have a polymer composition and/or physical properties which differ from the nonwoven fibers in the two edge regions. The selectively easier necking in the central region causes the central region to neck to about the same extent as the two edge regions, which otherwise would experience greater necking than the central region if the starting nonwoven web were completely uniform. Necked nonwoven webs and neck-bonded laminates made using the improved neckable nonwoven web, are also provided.

Description

Has the improved footpath conforming nonwoven web that contracts

Technical field

The present invention relates to nonwoven web, accept the footpath when this nonwoven web and contract when handling, on the transverse width of paper web, present the improved footpath uniformity that contracts.Compare with the nonwoven web after contracting than the traditional footpath that has lower basic weight at two fringe regions in central region, the nonwoven web after contracting in the final footpath that forms has more uniform basic weight on its width.

Background technology

Nonwoven web after contracting in the footpath comprises the spunbond paper web in back that directly contracts, melts and sprays paper web and its combination etc., and the technology of often utilizing Fig. 1 to schematically illustrate is made.Nonwoven web 12 with initial width A its machine direction by first roller to 16 and second roller to 26 between, first roller can be first breaker roll that moves with first surface speed to 16, and second roller can be with second breaker roll than the fireballing second surface speed operation of first surface to 26.First and second rollers between the superficial velocity difference cause the shaping of the nonwoven web 22 in narrower (footpath contract), this narrower nonwoven web 22 has the width A ' that contracts less than the footpath of initial width A.The second average surface speed be the first average surface speed about 1.05-1.7 doubly, suitable about 1.1 to 1.5 times of being about the first average surface speed preferably are about about 1.2 to 1.4 times of the first average surface speed.

The nonwoven web 22 that contracts of footpath generally includes compares finer and close compactness and at machine direction fiber more in line, the arrangement more at random of the fiber of this initial nonwoven web 12 with the fiber of initial nonwoven web 12.Make fiber fine and close compact and in line in, contract and handle the single fiber that can not stretch usually in the footpath.Contract and can be under the fusion temperature of fiber implement by heating in the footpath, this heating for example be by first and second rollers between stove or other thermal source are set.The footpath contract handle during or afterwards, the nonwoven web 22 after contracting in the footpath can also heat settings, therefore, the paper web that contracts in the footpath become some is stable.Stable nonwoven web is called as " contracting in reversible footpath " under the condition that directly contracts.By applying little stretching force, the nonwoven web that contracts in reversible footpath restrains easily at extending transversely, and when stretching force discharges, tends to change back to the structure that contracts in narrower footpath.

Initial nonwoven web 12 comprises fringe region 13 and 15, central region 11.The nonwoven web 22 that contracts of footpath comprises fringe region 23 and 25 and central region 21.Cause finer and close compactness that non woven fibre becomes and more in line owing to contract in the footpath, the single fiber or it is narrowed down of can not stretching significantly simultaneously, the nonwoven web 22 after contracting in the footpath have usually compared with the higher basic weight of beginning nonwoven web 12.

As Fig. 1 easily as can be known, compare with the fiber in the central region 11, the fringe region 13 of initial nonwoven web bears different distortion with non woven fibres in 15, and the footpath contract first roller handled to 16 and second roller to 26 between the bigger distance of operation.And the lateral stress in the central region 11 is partial offset at least, because these stress are two transversely effects.Lateral stress in each fringe region 13 and 15 is mainly in a direction, inwardly towards the center of paper web.This causes fringe region fiber gathering and the increase of directly contracting.As a result, the fiber in the fringe region 23 and 25 of the nonwoven web that contracts of footpath usually than the fiber in the central region 21 more in line and finer and close compactness.As a result, the nonwoven web that contracts of footpath has higher basic weight at two fringe regions than in central region laterally can be inconsistent, and at two fringe regions than having bigger extending transversely ability in central region.

Therefore, need or expect to provide a kind of manufacturing to have the nonwoven material that can directly contract of the nonwoven web that contracts in better horizontal conforming footpath.The nonwoven web that also needs or expect directly to contract, and lamination has the nonwoven web that contracts in the better laterally conforming footpath that comprises.

Definition

As used herein, term " recovery " refers to the contraction of expanded material when biasing force stops after applying biasing force to cause the material production tensile elongation.For example, if the footpath compression material of width with not bias voltage that loosens of one (1) inch promptly is stretched to 1 five (1.5) inches width in transverse extension 50%, this material will extend 50% (0.5 inch), and will have 150% the stretched width that it loosens width.If this typical expanded material loosens, and return to 1 one (1.1) inch width after bias voltage and tensile force discharge, then this material will return to 80% (0.4 inch) of its half (0.5) foot elongation.Recovery value can be expressed as [(maximum stretched dimension deducts the final sample size)/(maximum stretched dimension deducts the initial sample size)] * 100.

As used herein, term " nonwoven web " refers to a kind of like this paper web, and this paper web has single fiber or fine rule alternating layers but the non-structure that is discernible repetitive mode.In the past, the supatex fabric paper web is formed by several different methods, and for example meltblown, spun-bond process and combination are carded to the net method.

As used herein, term " microfiber " refers to that average diameter is not more than about 100 microns small diameter fibers, and for example its average diameter is from about 0.5 micron to about 50 microns, or more particularly, the average diameter of microfiber is from about 4 microns to about 40 microns.

As used herein, term " fiber combining " refers to utilize between single non woven fibre in order to form mutual adhesion paper web structure the combination of the thermal or the generation of tangling.Fibre matting is intrinsic in meltblown, but can produce or increase by for example fluid power entanglement method or needle point method.One or more thermal steps are used to form in the most methods of spunbond paper web.Alternatively or replenish ground, adhesive is used to increase the combination of expectation, and keeps the construction bonds of paper web.For example, can use powder adhesive and chemical solvent combination.

As used herein, term " meltblown fibers " refers to the fiber of formation like this, promptly by the thermoplastic material that will melt through a plurality of thin, circular, die capillaries extrudes usually, thereby form fine rule or the filament melted, and (for example enter high-speed gas, air) in the stream, this air-flow attenuates to reduce their diameter the filament of the thermoplastic material that has melted, and it can reduce to the microfiber diameter.After this, meltblown fibers is carried by high velocity air, and on the cohesion face of being deposited on, with the paper web of the meltblown fibers that forms random scatter.For example disclose this method in No. 3849241 United States Patent (USP)s authorizing people such as Butin, its disclosure provides as a reference at this.

As used herein, term " spun-bonded fibre " refers to small diameter fibers, the thermoplastic material of this small diameter fibers by will fusing is squeezed into filament from a plurality of thin common circular capillaries of spinning plate, the diameter that pushes filament then reduces rapidly and is shaped, for example, this is by drawing wire drawing or other known spunbond mechanism.For example referring to the United States Patent (USP) 4,340563 of authorizing Appel etc., authorize the United States Patent (USP) 3,692,618 of Dorschner etc., it has described the manufacturing of spunbond nonwoven webs.The disclosure of these two pieces of patents provides as a reference at this.

As used herein, fiber or fibrous mass that term " different fibers " refers to have different component of polymer and/or physical property are so that under condition was directly contracted in setting, first fibrous mass contracted than the selectively easier footpath of second fibrous mass of different fibers.

As used herein, " material of footpath after contracting " refers to any materials of having shunk a dimension at least by for example fiber elongation method or gathering method to term.

As used herein, term " can footpath compression material " refers to any materials that can directly contract.

As used herein, " central region " of term nonwoven web is defined as the central region 70% of the transverse width of nonwoven web." fringe region " is defined as and accounts for width outermost 15% zone in the both sides of the central region of nonwoven web.

As used herein, term " material after contracting in reversible footpath " refers to the material after contracting in a kind of like this footpath, process was handled when it contracted in the footpath, so that give material memory, like this, so that make material be stretched over it in advance during the reduced scale cun of footpath, when power stopped, were contracted in the back in the footpath and the part handled will return to it usually directly reduced scale is very little when applying power.A kind of form of processing is heating.In general, the stretching, extension of reversible footpath compression material is substantially limited in and extends to its footpath reduced scale cun in advance.Therefore, unless material is flexible, stretch too far exceed its in advance the footpath reduced scale cun will cause material damage.Reversible footpath compression material can comprise more than one deck, for example, and the spunbond paper web of multilayer, multilayer melts and sprays paper web, and the multilayer combination is carded to the net paper web, or any other suitable combination or its mixture, this describes in United States Patent (USP) 4965122, and its content provides as a reference at this.

As used herein, term " footpath contract percentage " refer to by measure can the footpath compression material the reduced scale of footpath in advance cun (width) and footpath the poor of back size (width) that contract, will differ from then divided by the very little definite ratio of the reduced scale of footpath in advance that can the footpath compression material.

As used herein, term " percent stretch " refers to by the increase of back size (in any direction) that measure to stretch, and will be worth divided by original dimension (at equidirectional) i.e. (increase/original dimension of size after the stretching) * 100 determined ratios.

As used herein, term " composite elastic directly contract back bond material " refer to have at least two positions with directly contract after the material of the flexure strip that engages of material.Flexure strip can engage with the material of footpath after contracting at discontinuous point, perhaps can with its complete combination.When realize engaging, the material after contracting in flexure strip and footpath becomes adjacency to construct.Contract in the footpath that is parallel to the material after contracting in the footpath usually direction tool elasticity of direction of composite elastic footpath sheepshank condensation material, and can stretch in the direction of the breakaway poing of footpath compression material.Composite elastic footpath sheepshank condensation material can comprise more than two-layer.For example, flexure strip can have the material after contracting with the footpath of its two side engagement, so that the structure of the material that three layers of composite elastics footpath sheepshank condensation material forms material/flexure strip/footpath after contracting in the footpath after contracting.Can add additional flexure strip, the material layer after contracting in the footpath, and/or intrinsic telescopic material is for example in conjunction with the carding paper web.Can use the combination of the material after contracting in other flexure strip and footpath, for example described in the United States Patent (USP) 5336545, this patent provides as a reference at this.

As used herein, term " polymer " " generally include but be not limited to, homopolymers, copolymer, for example, block, grafting, random and alternate copolymer, terpolymer etc., and composition thereof and modifier.And, unless otherwise specifically limited, term " polymer " " should comprise all possible molecular geometry of material.These structures include, but are not limited to isotaxy, syndiotaxy and random symmetries.

As used herein, term " selectively " covers term " only " and " largely ".

As used herein, term " basically by ... constitute " do not repel the existence of additional materials or method step, the desired character of this additional materials or given synthetic of not appreciable impact of method step or product.The typical material of this class includes but not limited to pigment, antioxidant, and stabilizing agent, surfactant, wax, flow promoter, solvent, particulate and being used for increase the interpolation material of the machinability of synthetic.

As used herein, term " comprises " and refers to that claim is open, to comprise additional material or the method step except proposing.

Summary of the invention

The present invention relates to have the nonwoven material that can directly contract of horizontal inconsistency, so that contract than in two easier footpaths of fringe region of nonwoven web in the central region of nonwoven web, and/or edge region stops the footpath to be contracted with respect to central region selectively.Comparing with fringe region contracts in the easier footpath of central region causes contracting greater than normal footpath selectively in central region, and this is enough to all or part of counteracting owing to utilize the bigger footpath in the intrinsic fringe region that traditional footpath compression method produces to contract.By changing chemistry (the being polymer) composition and/or the physical property of central region with respect to two fringe regions or vice versa, can realize causing the central region horizontal inconsistency that contracts of footpath easily.

The invention still further relates to nonwoven web and laminated product after contracting in the footpath, it has more uniform footpath contracts, more uniform basic weight, and laterally-elongated, and it utilizes the nonwoven material that can directly contract of the present invention to make.

The many nonwoven webs that comprise spunbond paper web utilize the fiber combining process to make, and this fiber combining process combines adjacent fiber at diverse location according to binding pattern.In one embodiment of the invention, by changing the fiber combining pattern (or pattern) between central region and two fringe regions so that central region selectively easily the mode that contracts of footpath realize the horizontal inconsistency of the nonwoven material that can directly contract.This can be by realizing than providing than the fiber combining zone of low percentage at two fringe regions in central region.This is successively by with the realization of getting off, it is the binding pattern that a) is provided at central region than cause more manying between the adjacent combination free space at two fringe regions, and/or b) under regional temperature of using and/or pressure are low than jointing edge temperature and/or pressure, by changing bond strength in conjunction with central region.

In another embodiment of the present invention, the physical property of fiber changes between the central region of nonwoven material and two fringe regions, so that contract in the footpath easily in central region.For example, can provide the fiber of thinner (having low fiber denier), and the fiber of thicker (having height fiber denier) is provided in another zone in a zone.And, can be provided with more at random or the fiber of transversal orientation in central region, and the more fiber of multimachine device direction orientation can be set at two fringe regions.And, in central region the fiber of more circles can be set, and the still less fiber of circular (having difformity) can be set at two fringe regions.And, in central region the seldom fiber of compact (having than low bulk) can be set, and the fiber of more compactnesses (having than high bulk density) can be set at two fringe regions.And the fiber that curls can be arranged on fringe region rather than in central region, contract with respect to the footpath of central region so that reduce fringe region selectively.And, can be provided with to follow at two fringe regions and extrude Electrostatic Treatment and cross, and fiber without Electrostatic Treatment (less being in line) can be set in central region so that produce better straight fiber.

In another embodiment of the present invention, the chemistry of the fiber of central region (being polymer) composition is different with the component of polymer of the fiber of two fringe regions.Contracting in the easier usually footpath of polymer fiber with low rigidity modulus, and is more suitable for central region.For example, polypropylene fibre can be arranged in the fringe region, central region can be provided with a) polypropylene-polyethylene and ethylene copolymers fiber simultaneously, b) polyethylene fiber, c) mixture of polypropylene fibre and polyethylene fiber, d) the polyethylene-polypropylene bicomponent fiber fiber made of polypropylene and poly mixture, and/or e).

Description of drawings

Fig. 1 is the contract schematic diagram of method of aforesaid traditional footpath; And

Fig. 2 and 3 makes the footpath sheepshank to close the schematic diagram of the method for laminate.

The specific embodiment

With reference to figure 1, the nonwoven web 12 that can directly contract has a central region 11 and two ends 13 and 15.Central region 11 has and two ends 13 and 15 different physical property and/or component of polymer, and therefore, central region has relatively easy footpath and contracts.

As mentioned above, central region 70%, two fringe region in centre of being defined as the transverse width of nonwoven web is defined as the outermost 15% of the transverse width of central region both sides.Yet, this do not mean that selectively the non woven fibre after contract in the footpath easily and the fiber that is difficult to contract in the footpath between the border must accurately be positioned at the edge 17 and 19 of central region.These borders can be positioned at central region edge 17 and 19 or outer, as long as central region contracts than two easier footpaths of fringe region on average.

For example, easily to can be positioned on from the edge 27 of nonwoven web 12 and 29 inside total distances be about 2% to about 40% (is 100% based on total transverse width) to the border between the fiber that contracts of the fiber that contracts of footpath and difficult footpath selectively, suitably, 27 and 29 inside total distances are about 5% to about 30% from the edge, best, 27 and 29 inside total distances are about 10% to about 25% from the edge.For the homogeneous nonwoven web, the main part that directly contracts constitutes similar outer six inches width of the both sides of nonwoven web, and does not consider initial paper web width.Like this, for the present invention, easily the footpath contract and the fiber that is difficult to contract in the footpath between the border preferably can be about 6 inches apart from the edge of parent material.

As an alternative, physical property and/or component of polymer can be from the edge 27 and 29 inwardly change in the gradient mode, border accurately not between the non woven fibre after contracting in non woven fibre after contract in the footpath easily selectively and difficult footpath.Do not consider whether have border or gradient, and do not consider where this border places that the central region 11 of nonwoven web 12 will contract than two fringe regions 13 and 15 easier footpaths on average.

In one embodiment of the invention, the fiber combining pattern between central region and two fringe regions so that the mode that central region contracts with easier footpath change.For example, central region can have the fiber combining (based on the plane of supatex fabric) than two lower percentages of fringe region.Supatex fabric after contracting in suitable footpath typically has the fiber combining face of about 1-50%.According to the present invention, central region 11 can have a total fiber combining face, and this total fiber combining face is littler of 3% than total faying face of two fringe regions 13 and 15, and is suitable to when young about 5%, preferably to when young about 7%.For example, if two fringe regions 13 and 15 (be defined as on nonwoven web 12 every sides outer 15%) have 20% average faying face, central region 11 (being defined as the central region 70% of nonwoven web 12) should have 17% or littler average faying face so, suitable about 15% or littler, preferably about 13% or littler.Provide fringe region 13 and 15 so that be in the mode that increases combination selectively, nonwoven web be shaped according to traditional manufacturing technology and equably in conjunction with after, make fringe region bear hot gas cutter or similar less important associated methods selectively.Disclose the hot gas cutter in the United States Patent (USP) 5707468 of authorizing Arnold etc., its content provides as a reference at this.And, as mentioned above, can under temperature lower and/or pressure, finish than two ends in the original combination of central region.

As an alternative, between non woven fibre, central region 11 can be provided with the binding pattern of less restriction, and two fringe regions 13 and 15 can be provided with the binding pattern of more restriction.Contract for the footpath, seldom Xian Zhi binding pattern can be that single combination is elongated and majority is oriented in machine direction.The binding pattern of more restriction can be that single combination is elongated and majority is oriented in laterally.Elongated binding site can have rectangle or ellipse, for example, can have the length diameter ratio at least about 2: 1, preferably at least about 4: 1.In one embodiment, in central region 11, the binding site with length diameter ratio of 4: 1 is oriented in machine direction, in two fringe regions 13 and 15, is oriented in laterally.Between central region and two fringe regions, orientation can be suddenly or the conversion of increment ground.In another embodiment, central region can have greatly to be separated, and be the big point or the some binding pattern of round dot, fringe region can have compacter separation, and be the little point or the some binding pattern of round dot, under any situation, the average percent faying face of central region and two fringe regions can be identical, and central region will have easier footpath and contract.

As an alternative, central region 11 can be provided with the non woven fibre (less average denier) of non woven fibre for approaching of comparing in two fringe regions 13 and 15.Directly contract easily selectively in order to be implemented in central region, fiber in the central region 11 should have a kind of average fiber denier, this average fiber denier is littler of 5% than the average fiber denier of the fiber in two fringe regions 13 and 15, suitable at least about 10%, preferably at least about 20%.For example, if the average fiber deniers in two fringe regions 13 and 15 are 5.0, the average fiber denier in central region 11 should be 4.75 or littler so, and suitable is 4.5 or littler, and best 4.0 or littler.Compare with the average denier's of height fiber, have lowly than harmonic(-)mean denier's fiber rigidity, easily tortuous, result footpath easily contracts.Utilize in central region and fringe region, to have narrower respectively and the spinning head broad opening, different deniers can be provided.

As an alternative, central region 11 can be provided with more at random or the fiber of transversal orientation, and two fringe regions 13 and 15 can be provided with the fiber of more passion direction orientations.For example, during non-woven when making (for example spunbond or melt and spray) paper web, when fiber left the spinning head mould, fringe region can bear entrainmenting of fair speed and sudden cold air stream than central region.The air of fair speed causes the fiber edge region than more be in line in central region (orientation of machine direction).

As an alternative, central region 11 can be provided with round on average fiber, and fringe region 13 and 15 can be provided with the fiber of not too justifying (other shape) on average.The length diameter ratio of fiber is the wide diameter of fiber and the ratio of narrow diameter.Yuan fiber has 1.0 length diameter ratio fully.For be implemented in central region selectively easily the footpath contract, the average fiber length diameter in the central region 11 than with fringe region 13 and 15 in the average length diameter ratio of fiber should be little at least about 0.5, suitable at least about 0.75, preferably at least about 1.0.Believe that circular fiber is more prone to the footpath and contracts, but more be not inclined to physical deformation or stretching than plane or profiled filament.

As an alternative, with the fiber ratio in the fringe region, central region can be provided with not compact fiber, and has lower average bulk density.Directly contract easily selectively in order to be implemented in central region, central region 11 should have a kind of so average bulk density, this average bulk density is littler of 5% than the average bulk density of two fringe regions 13 and 15, and is suitably little of 10%, preferably little of 20%.Fiber than low bulk has bigger space usually between it, and with compare than the compacter fiber of high bulk density easier displacement and the footpath contract.A kind of mode that changes bulk density in the mode of expecting is to make fringe region 13 and 15 receive compression process selectively.This can receive the pressurization calender line selectively by making fringe region, perhaps by making whole supatex fabric receive the roll forming calender line, so that edge region provides higher pressure to realize.

As an alternative, fringe region 13 and 15 can be provided with curling non woven fibre, and central region 11 can be provided with seldom or unconvoluted fiber (or curling and the uncrimped fibers mixture).Crimped fibre should have at least four curling crimpnesses of per inch, and at least six of suitable per inch curl, and preferably at least ten of per inch curl.For the present invention, have zero to being considered to unconvoluted less than four curling fibers of per inch.The fiber that curls seldom tends to the footpath and contracts, because these fibers contract and must straighten to straight line basically before the tension force bearing arbitrarily significant footpath.Straight fiber curls mutually, and the stage directly contracts in early days, contracts in final more footpath.Selectively directly contract easily in order to be implemented in the central region 11, central region 11 can be provided with at least 60% fiber that curls, and fringe region 13 and 15 can be provided with at least 60% fiber that curls.As an alternative, central region can be provided with unconvoluted fiber, and simultaneously, fringe region is provided with at least 20% fiber that curls.Irrespective selected percentage, the difference between the percentage of the percentage of the crimped fibre in central region and the fiber in two fringe regions should be at least about 10%, and preferably at least about 20%, the crimped fibre of higher percent is present in fringe region.

As an alternative, fringe region 13 and 15 can be provided with than the more straight fiber of fiber in the central region 11.This can extrude out the back and with before forming conveyer contact, processing realizes to the fiber electrostatic in this fringe region (for example corona) from spinning head by the fiber in the edge region.The corona treatment of the fiber in the edge region only causes its mutual electrostatic attraction, so more is in line.

In another embodiment of the present invention, the component of polymer of the component of polymer of the non woven fibre in the central region 11 and two fringe regions 13 and 15 interior non woven fibres is different, therefore, the fiber in the central region has lower rigidity (lower modulus) than the fiber in two fringe regions on average.For realizing directly contracting easily selectively in the central region, central region 11 can be provided with at least 60% fiber with first component of polymer, fringe region 13 and 15 can be provided with at least 60% fiber with two polymer compositions, and first component of polymer has lower modulus than second component of polymer.As an alternative, central region can be provided with the fiber that integral body has first composition, and fringe region can be provided with at least 20% fiber with second composition.Do not consider selected percentage, having should be at least about 20% than the difference of the percentage of the fiber in the percentage of the fiber in the central region of first composition of low modulus and the fringe region with first composition, suitable to 30%, and preferably minimum about 50%.

For example, nonwoven web 12 can be by crystalline polypropylene fiber basically (by polypropylene or to comprise percentage by weight be that random third rare-ethylene copolymer of 10% ethene forms), with comprise amorphous or hypocrystalline third rare-ethylene copolymer fibres of surpassing 10% ethene in conjunction with forming, wherein the ethylene contents difference between two kinds of polymer types is at least 5% based on total polymer weight.According to the present invention, central region should comprise the weight percent amorphous or semi-crystalline co-polymers fiber (based on the gross weight of the fibre blend in the central region) of two fringe regions (it should comprise the fiber of crystalline polypropylene basically of corresponding high level) as many as few 20% frequently.Suitable, central region comprises and lack percentage by weight than two fringe region as many as is 30% amorphous or semi-crystalline co-polymers fiber, and preferably as many as less 50%.

Similarly, nonwoven web 12 can be formed by the combination of aforesaid fiber of crystalline polypropylene basically and polypropylene, polyethylene bicomponent fiber.The polyethylene of the percentage by weight that bicomponent fiber all comprises into two phase out-phase from the polypropylene of 10-90% and percentage by weight from 10-90%, suitable, for the percentage by weight of every kind of composition becoming two phase out-phase accounts for 25-75%.Bicomponent fiber can have polypropylene cores and polyethylene sheath, perhaps, can have structure side by side, polypropylene is in a side, polyethylene is at opposite side, perhaps can have " oceanic island " structure, and its continuous " matrix " with a kind of discontinuous phase of polymer and another kind of polymer mutually.As mentioned above, based on the total fiber weight in the central region, this central region will comprise than two that fringe region comprised greatly at least 20%, and will be suitable greatly at least 30%, preferably big at least 50% bicomponent fiber.If fringe region comprises 100% polypropylene fibre and 0% bicomponent fiber, for example, central region will comprise at least 20%, and will be suitable at least 30%, preferably at least 50% bicomponent fiber.If fringe region comprises 70% polypropylene fibre and 30% bicomponent fiber, central region will comprise at least 50%, and will be suitable at least 60%, preferably at least 80% bicomponent fiber.

What do not consider to select is that above-mentioned that embodiment or its change, and effect is that the central region 11 of nonwoven web 12 is contracted than fringe region 11 and 13 relatively easy footpaths.This causes footpath bigger selectively in the central region to be contracted, and contracts in this bigger footpath that is enough to influence in the intrinsic fringe region that takes place during method is contracted in traditional footpath.The nonwoven web 22 that contracts in final footpath should have basically basic weight uniformly.Particularly, when initial nonwoven web machine direction be stretched to its initial length at least about 1.2 times, preferably about 1.25 times so that produce the footpath when contracting, basic weight after the average diameter of central region contracts should be in pact ± 7% scope of the average basis weight of two fringe regions, suitable average basis weight at two fringe regions pact ± 5% scope in, be preferably in two fringe regions average basis weight pact ± 3% scope in.

Conforming another test of the nonwoven web of footpath after contracting is transverse extension measurement amount during based on the destruction of utilizing ASTMD5034 to measure.Begin inwardly to cut out the sample that is measured as one inch of horizontal three inches and machine direction at two sides of the nonwoven web of footpath after contracting.Accurately cut at the center of the nonwoven web after similarly sample contracts from the footpath.Each sample places in the INSTRON  test instrument, so that accompany one inch sample in each pawl, when pawl opened mutually, one inch transverse width can stretch.

And, the nonwoven web of footpath after contracting should have for its initial length at least about 1.2 times, back machine direction length contracts in preferably about 1.25 times footpath.There is the substantial variations of transverse extension amount when destroying in nonwoven web after contracting for the footpath of prior art between central region and edge sample.Transverse extension amount when bearing the edge sample that contracts in big footpath and having than the significantly high destruction of central region sample.For the present invention, transverse extension amount height was no more than 20% when the transverse extension amount should be than the destruction of central region sample during destruction that two edge samples have, and suitable is no more than 10%, preferably is no more than 5%.For this specification and appended claims, when the central region sample destroys during the highest destruction of transverse extension amount and two edge samples the difference percentage between the transverse extension amount be defined and to be called " the inconsistent coefficient of transverse extension amount during destruction " certain, nonwoven web after contracting in the footpath should have at least about 9 inches, width after preferably contracting at least about 15 inches footpath is in order to measure use.

The others of the method for Fig. 1 are traditional, are described in the above in the background parts of the present invention.Firing equipment (not shown), stove for example, can be arranged in first roller to 16 and second roller between 26.Paper web typically began the footpath and contracts before entering stove.Stove can be used for helping the footpath to contract and makes whole nonwoven web thermosetting, thereby produces the nonwoven web 22 after contracting in the footpath of contracting in reversible footpath.Temperature in the stove should be enough high, so that make non woven fibre softening, and increases its pliability, but do not have high to or a) make the fiber thawing, or b) fiber softening is arrived to a certain degree,, narrow down and/or destroy so that the footpath method of contracting causes single non woven fibre to stretch significantly.When non woven fibre was made by polyolefin, for example, the maximum temperature that nonwoven web reached in the stove should be under the fusion temperature of fiber at least about 20 ℃, suitably, should be under the fusion temperature of fiber at least about 25 ℃, best, should be under the fusion temperature of fiber at least about 30 ℃.The best footpath temperature that contracts is typically under the fusion temperature of fiber about 30-60 ℃.When nonwoven web for example was spunbond polypropylene paper web, the footpath of the expectation temperature that contracts was about 105-140 ℃.

The material 12 that can directly contract can be formed by for example known nonwoven processes, as meltblown, and spun-bond process, or be carded to the bonding paper web method of net, and directly pass through roller to 16, and can at first not be stored on the feed rolls.

Can footpath compression material 12 can be nonwoven material for example, for example spunbond paper web melts and sprays paper web and is carded to the bonding paper web of net.If can directly contract simultaneously by handling by footpath compression material 12 so that after processing, apply power in case the material after the footpath contracted is stretched over it directly contract before large-sized any materials make, when power stopped, material returned to its size after directly contracting usually.A kind of method of processing is heating.Some polymer are polyolefin for example, and the heat treatment under suitable condition of polyester and polyamide is to give its Memorability.Typical polyolefin comprises one or more polyethylene, polypropylene, polybutene, ethylene copolymer, propylene copolymer, and butylene copolymer.Discovery is that useful polypropylene for example comprises from Himont company and indicates the polypropylene that PF-304 buys with commodity, indicates Escorene PD from Exxon-Mobil chemical company with commodity ^-3445 polypropylene of buying and the polypropylene of buying with commodity sign DX-5A09 from Shell chemical company.Can also use polyethylene, comprise the ASPUN that buys from Dow chemical company ^6811A and 2553 linear low density polyethylene, and different high density polyethylene (HDPE)s.The chemical feature of these materials can obtain from its corresponding manufacturer.

In one embodiment of the invention, can footpath compression material 12 be multilayer materials, it for example has with one deck at least and melts and sprays paper web, is carded to the spunbond paper web of one deck at least that the bonding paper web of net or other suitable material engage.For example, the material 12 that can directly contract can be a multilayer material, it have basic weight be every square yard from about 0.2 spunbond polyolefin ground floor to about 8 ounces (osy), basic weight is for from about 0.1 to about 4osy the polyolefin layer that melts and sprays, and basic weight is the spunbond polyolefin second layer from about 0.2 to about 8osy.

As an alternative, can footpath compression material 12 can for example be monolayer material, for example basic weight is the spunbond paper web from about 0.2 to about 10osy, perhaps basic weight is the polyolefin that melts and sprays from about 0.2 to about 8osy.

Can also comprise the composite of making by the mixture of two or more mixture of different fibers or fiber and particulate by footpath compression material 12.This mixture can be by adding fiber and/or particulate formation in air-flow, carry meltblown fibers in this air-flow, therefore, before on the gathering-device, meltblown fibers and other material (wood pulp for example, staple fiber or particulate take place at fiber collecting, superabsorbent materials for example) contiguous the entanglement mixes, with the meltblown fibers of formation random scatter and the adhesion paper web of other material, this is for example open in United States Patent (USP) 4100324, and its disclosure provides as a reference at this.

If the material 12 that can directly contract is the fiber non-woven paper web, fiber should utilize one or more combined techniqueses of describing in aforementioned " DEFINITION " fiber combining to engage by fiber combining.

Original width that can footpath compression material 12 and determined the extension limit of the material 12 after contracting in reversible footpath in the relation between the width after the stretch-draw.For example, referring to Fig. 1, if the material after contracting in the reversible footpath of expectation preparation, material after contracting in this reversible footpath can be stretched to elongation 150% (be its directly contract the back width 250%), and can return to its width that can directly contract about 25% in, " " can stretching by the footpath compression material of 250cm for example is so that it directly is reduced to the width A ' of about 100cm to A, to reach about 60% the footpath percentage that contracts to have width.When stretch-draw, it is by heat treatment, with structure 22 after keeping reversible footpath to contract.The reversible footpath compression material that generates has the width A ' of about 100cm, and can be stretched to the directly initial at least 250cm size " A " of compression material, so that elongation or percent stretch are about 150%.Discharge so that recover after about 83% at tensile force, the footpath that the material after contracting in reversible footpath can return to its 100cm contract the back width 25% in (i.e. the width of about 125cm).

Claim of the present invention requires to cover and is adapted at the even footpath compression material of cross directional stretch at least 75%, and has covered the 75% back recovery at least 50% that stretches, and loosens then.

Fig. 2 has schematically illustrated and has prepared the program 100 that laminated product is closed in footpath of the present invention sheepshank, and this laminated product comprises two footpaths contract spunbond paper web and the elastic film between it.In this process, the elastic film extrusion molding between the spunbond paper web that contracts in two footpaths.The central region of spunbond paper web has composition and/or the physical property that is designed to improve selectively these regional contracting property of internal diameter.

Referring to Fig. 2, the first and second

spunbond paper web

112 and 212 are by feed rolls 101 and 201 uncoilings.The first spunbond paper web 112 is passed first roller to 16, comprises

roll

114 and 118, rotates with first surface speed; And pass through second roller to 226, comprise

roll

224 and 228, to rotate than the fast second surface speed of first surface.By stove 129, being contracted in the footpath of the spunbond paper web of 116 and second roller between to 226 at first roller is subjected to the influence of different superficial velocities.Stove 129 is heated to whole nonwoven web about 20-60 ℃ temperature under the fusion temperature of spun-bonded fibre.

The second spunbond paper web 212 is passed the 3rd roller to 216, and this roller rotates with the 3rd superficial velocity, and passes above-mentioned second roller to 226 comprising

roll

214 and 218, comprises

roll

224 and 228, rotates with second surface speed.Second surface speed is higher than the 3rd superficial velocity, and therefore, contract in the influence footpath between rolling 216 and 226.As shown in the figure, whole nonwoven web 212 does not utilize the stove heating.Yet the second spunbond paper web 212 (the similar first spunbond paper web 112) has central region, and this central region has and is designed to the physical property and/or the component of polymer that contract with respect to the footpath that two fringe regions increase central region selectively.

Close laminated product 230 in order to make the footpath sheepshank, molten elastomer squeezes out through the mould nozzle, extrudes elastic film 136 with formation.Extrude elastic film 136 and directly be deposited on stretch-draw and directly contract between spunbond paper web 122 and 222, whole three layers are located at together in to 226 at roller.After film leaves mould nozzle 134, extrude elastic film 136 and can contact with 222 with footpath compression material 122 and be no more than about 0.1-1.0 second, suitable about 0.25-0.5 is in second, and preferably about 0.3-0.45 is in second.

Elastomeric film can extrude under about 180-300 ℃ temperature, and what this temperature was suitable is about 200-250 ℃.

Light pressure acts on roller in 226, so that elastic film 136 (at tensile state not relatively) is attached on the

nonwoven web

212 and 222 after stretch-draw is directly

contracted.Roll

224 and 228 can or cannot cotton ginning, does not need heating, and can cool off (for example arrive about 10-30 ℃ temperature), so that suppress elastic film between the spunbond paper web after directly contracting.Because the ductility of the nonwoven web that contracts in the footpath, laminated product 230 is closed in the footpath sheepshank of generation can be at cross directional stretch.When lax, because the indentation of elastic film influence, laminated product 230 will turn back to its initial structure of making basically.Disclose the further details of utilizing fusion elastic film manufacturing footpath sheepshank to close laminated product in authorizing the United States Patent (USP) 5514470 of Haffner etc., the content of this patent provides as a reference at this.

Fig. 3 represents to be used for the alternative method 300 of manufacturing laminated product of the present invention.In the method, the extending or elastic film of preform combines with the nonwoven web that contracts in the footpath.Extending film is to stretch but the film that there is no need to bounce back as elastic film.The central region of nonwoven web 312 has and is designed to compare two fringe regions and increases component of polymer and/or the physical property that contracts in the footpath selectively in central region.

Referring to Fig. 3, nonwoven web 12 (for example, spunbond-melt and spray-the spunbond layer stampings) is separated coiling from feed rolls 301.Nonwoven web 12 passes first roller to 316, comprises the roll 314 and 318 that rotates with first surface speed; With second roller to 326, comprise the roll 324 and 328 that rotates with the second surface speed that is higher than first surface speed, so that form the nonwoven web 322 that contracts in the footpath.

Extending or elastic film 136 is separated coiling from feed rolls 130, and with basically not tensile state combine with nonwoven web 322 after contracting in the footpath of stretch-draw, these two kinds of materials pass second roller to 326.One or two roller 324 and 328 can utilize technology well known in the art heating, so that combining between the nonwoven web after influencing extending or elastic film and directly contracting.Disclose the further details of the process that the nonwoven web that contracted in performed thin film and footpath combines in authorizing the United States Patent (USP) 5883028 of Morman etc., the content of this patent provides as a reference at this.Because the influence of the nonwoven web after contracting in the footpath, the laminated product 330 of generation has lateral extensibility.When stretching force was removed, if film is flexible, laminated product 330 turned back to it basically and makes structure.If film is only extensible but nonelastic, laminated product will can significantly not recover.

Film 136 (Fig. 2 or 3) can be made by any materials, and this material can be made plate shape.Usually, arbitrarily suitable extending or elastic film shaping resin or the mixture that comprises it can be used for film.

For example, film 136 can be made by the elastic block copolymer with general formula A-B-A ', here A and A ' comprise for example thermoplastic polymer's end block of poly-(ethene aromatic hydrocarbons) of part styrene, and B is a piece in the elastomeric polymer, for example conjugated diene or low olefin polymer.Film 136 can be for example by making with (polystyrene/poly-(ethylene butene)/polystyrene) block copolymer that trade mark KRATON G buys from Shell chemical company.A kind of such block copolymer can be KRATON G-1657 for example.

Other spendable typical elastomeric material comprises for example polyurethane elastomeric materials, for example from B.F.Goodrich ﹠amp; Co. polyurethane elastomeric materials and for example polyester elastomeric material of buying with trade mark ESTANE is for example from E.I.Dupont De Nemours ﹠amp; Company. the polyester elastomeric material of buying with commodity sign Hytrel.For example disclose the elastic plate that the polyester elastomeric material forms in authorizing the United States Patent (USP) 4741949 of Morman etc., this patent provides as a reference at this.

Polyolefin can be used to make extending film separately, or can mix with elastomeric polymer, to improve the processing characteristics of thin film composition.Polyolefin must be can extrude under the condition of the suitable combination of temperature of bearing elevated pressure and rising, becomes separately or the polyolefin of mixed form.Useful polyolefine material comprises for example polyethylene, and polypropylene and polybutene comprise ethylene copolymer, third rare copolymer, and butylene copolymer.Useful especially polyethylene can represent that with commodity Petrothaene NA601 (being also referred to as PE NA601 or polyethylene NA601) obtains from U.S.I. chemical company.Can utilize two or more polyolefin.Elastomeric polymer and the polyolefinic mixture that extrudes are open in the United States Patent (USP) 4663220 of for example Wisneski etc., and this patent provides as a reference at this.

Film 136 can also be pressure-sensitive elasticity adhesive plate.For example, elastomeric material itself can be that some is sticking, or alternative, and compatible binding resin can add in the above-mentioned elastic component that extrudes, so that the elastic plate that for example can be used as contact adhesive to be provided, thereby the non-resilient paper web that is contracted in the elastic plate and the footpath of stretch-draw combines.Consider that binding resin and bonding can extrude elastic component, notice that this resin and composition describe in the United States Patent (USP) 4789699 of authorizing J.S.Keiffer and T.J.Wisneski etc., this patent is open on October 15th, 1986, name is called " environment temperature can in conjunction with the elastic non-woven paper web ", and this patent provides as a reference at this.

Can use any tackifier resins, it is compatible with elastomeric polymer, and can bear high (for example extruding) temperature of handling.If use composite material for example polyolefin or extending oil, binding resin also should be consistent with those composite materials.Usually, combine preferably binding resin of Petropols with hydrogen, because it has better temperature stability.REGALREZ ^TMAnd ARKON ^TMP series tackifier are the examples that combine Petropols with hydrogen.ZONATAKT ^TM501lite is an example of terpene hydrocarbon.The REGALREZ Petropols obtain from Hercules Incorporated.ARKON P series plastics obtains from Arakawa Chemical (U.S.A) Incorporated.Certainly, the invention is not restricted to use this three kinds of binding resins, also can use other binding resin, other composition of this binding resin and synthetic is compatible, and can bear high treatment temperature.

Pressure-sensitive elastic adhesive can comprise for example from about 40% to about 80% elastomeric polymer of percentage by weight, from about 5% to about 40% polyolefin and from about 5% to about 40% tackifier resin.For example, useful especially synthetic comprises the KRATON G-1657 of percentage by weight from about 61% to about 65%, from about 17% to about 23% polyethylene NA-601 and from about 15% to about 20% REGALREZ 1126.

Film 136 can also be a multilayer material, and wherein it can comprise two or more independent adhering film layers.If film is flexible, it can with stretch in machine direction before the nonwoven web 322 that contracts of footpath combine, with the formation laminated product, this laminated product is in machine direction and laterally have elasticity.Similarly laminated product is open in United States Patent (USP) 5116662, and this patent provides as a reference at this.

Because the improved uniformity of the nonwoven web composition after contracting in the footpath, laminated product of the present invention has improved basic weight uniformity.Nonwoven web when the footpath after contracting be stretched to its initial machine direction length at least about 1.2 times, preferably about 1.25 times, thereby cause the footpath to be contracted, laminated product of the present invention zone (being defined as the centre 70% of the width of laminated product) in the middle should have an average basis weight, and this average basis weight is pact ± 7% of the average basis weight of two fringe regions (being defined as the outside 15% of the width on every side of laminated product).Suitable, the average base unit weight of central region should be pact ± 5% of the average basis weight of two fringe regions.Best, the average basis weight of central region should be pact ± 3% of the average basis weight of two fringe regions.

Although embodiments of the invention disclosed herein are preferred, under the prerequisite that does not exceed essence of the present invention, the present invention can do different modifications and improvement.Scope of the present invention is limited by appended claims, and all changes that drop in implication of the present invention and the equivalent scope all are included in protection scope of the present invention.

Claims

1. nonwoven web that can directly contract, it comprises:

A central region and two fringe regions;

Central region comprises a plurality of first fibers;

Two fringe regions comprise a plurality of second fibers different with first fiber;

Select the fiber in central region and the fringe region, contract so that provide selectively easier footpath in central region.

2. the nonwoven web that can directly contract as claimed in claim 1 is characterized in that, first fiber has the first area percentage of fiber combining, and second fiber has the second area percentage of fiber combining, and second percentage is lower than first percentage.

3. the nonwoven web that can directly contract as claimed in claim 2 is characterized in that, the first area percentage of fiber combining is littler of 3% than the second area percentage of fiber combining.

4. the nonwoven web that can directly contract as claimed in claim 2 is characterized in that, the first area percentage of fiber combining is littler of 5% than the second area percentage of fiber combining.

5. the nonwoven web that can directly contract as claimed in claim 2 is characterized in that, the first area percentage of fiber combining is littler of 7% than the second area percentage of fiber combining.

6. the nonwoven web that can directly contract as claimed in claim 1 is characterized in that, central region comprises associative key between the elongated fibers that are oriented in machine direction more, and two fringe regions comprise the horizontal fibre-to-fiber bonds that are oriented in more.

7. the nonwoven web that can directly contract as claimed in claim 1 is characterized in that, central region comprise more greatly and the fiber of separating far away between put associative key, two fringe regions comprise between the fiber of less and closeer separation puts associative key.

8. the nonwoven web that can directly contract as claimed in claim 1 is characterized in that, the fiber in the central region has the first average denier, and the fiber in the fringe region has the second average denier, and the first average denier is less than the second average denier.

9. the nonwoven web that can directly contract as claimed in claim 8 is characterized in that, the first average denier is than the second average denier little at least 5%.

10. the nonwoven web that can directly contract as claimed in claim 8 is characterized in that, the first average denier is than the second average denier little at least 10%.

11. the nonwoven web that can directly contract as claimed in claim 8 is characterized in that, the first average denier is than the second average denier little at least 20%.

12. as claim 1 the fast nonwoven web that can directly contract, it is characterized in that, the fiber in the central region relatively more at random or transversal orientation, and the fiber in two fringe regions is more in the machine direction orientation.

13. the nonwoven web that can directly contract as claimed in claim 1 is characterized in that, the fiber in two fringe regions is more straight than the fiber in the central region.

14. the nonwoven web that can directly contract as claimed in claim 1, it is characterized in that, fiber in the central region has the first average length diameter ratio, and two interior fibers of fringe region have the second average length diameter ratio, and first average length diameter ratio is less than the second average length diameter ratio.

15. the nonwoven web that can directly contract as claimed in claim 14 is characterized in that, the first average length diameter frequently the second average length diameter than little at least about 0.5.

16. the nonwoven web that can directly contract as claimed in claim 14 is characterized in that, the first average length diameter frequently the second average length diameter than little at least about 0.75.

17. the nonwoven web that can directly contract as claimed in claim 14 is characterized in that, the first average length diameter frequently the second average length diameter than little at least about 1.0.

18. the nonwoven web that can directly contract as claimed in claim 1, it is characterized in that, fiber in the central region has the first average bulk density, and two interior fibers of fringe region have the second average bulk density, and the first average bulk density is less than the second average bulk density.

19. the nonwoven web that can directly contract as claimed in claim 18 is characterized in that, the first average bulk density is littler of 5% than the second average bulk density.

20. the nonwoven web that can directly contract as claimed in claim 18 is characterized in that, the first average bulk density is littler of 10% than the second average bulk density.

21. the nonwoven web that can directly contract as claimed in claim 18 is characterized in that, the first average bulk density is littler of 20% than the second average bulk density.

22. the nonwoven web that can directly contract as claimed in claim 1 is characterized in that, first fiber does not curl, and second fiber crimp, second fiber that exists in the fringe region is than the height at least 10% that exists in the central region.

23. the nonwoven web that can directly contract as claimed in claim 22 is characterized in that, second fiber that exists in the fringe region is than the height at least 20% that exists in the central region.

24. the nonwoven web that can directly contract as claimed in claim 1, it is characterized in that, first fiber has first component of polymer, second fiber has second component of polymer different with first component of polymer, and the fiber in the central region is on average than the less rigidity of fiber in two fringe regions.

25. the nonwoven web that can directly contract as claimed in claim 24 is characterized in that, first fiber that exists in the central region than the interior height of two fringe regions at least about 20%.

26. the nonwoven web that can directly contract as claimed in claim 24 is characterized in that, first fiber that exists in the central region than the interior height of two fringe regions at least about 30%.

27. the nonwoven web that can directly contract as claimed in claim 24 is characterized in that, first fiber that exists in the central region than the interior height of two fringe regions at least about 50%.

28. the nonwoven web that can directly contract as claimed in claim 24 is characterized in that, first fiber comprises the rare copolymer of ethene-third, and second fiber comprises polypropylene.

29. the nonwoven web that can directly contract as claimed in claim 24 is characterized in that first fiber comprises polyethylene, and second fiber comprises polypropylene.

30. the nonwoven web that can directly contract as claimed in claim 24 is characterized in that first fiber comprises the polypropylene, polyethylene bicomponent fiber, and second fiber comprises polypropylene.

31. the nonwoven web after contracting in a footpath, it have for the length of initial footpath before contracting at least about 1.2 times length, the nonwoven web after this directly contracts comprises:

A central region and two fringe regions;

Central region comprises a plurality of first fibers and has first average basis weight;

Two fringe regions comprise a plurality of second fibers different with first fiber and have second average basis weight; And

First basic weight is in pact ± 7% of second basic weight.

32. the nonwoven web after contracting in footpath as claimed in claim 31 is characterized in that, first basic weight is in pact ± 5% of second basic weight.

33. the nonwoven web after contracting in footpath as claimed in claim 31 is characterized in that, first basic weight is in pact ± 3% of second basic weight.

34. the nonwoven web after contracting in a footpath, it has the width after contracting at least about nine inches footpath, for initial footpath contract before length at least about 1.2 times length and be no more than 20% horizontal inconsistent coefficient.

35. the nonwoven web after contracting in footpath as claimed in claim 34 is characterized in that, horizontal inconsistent coefficient is no more than about 10%.

36. the nonwoven web after contracting in footpath as claimed in claim 34 is characterized in that, horizontal inconsistent coefficient is no more than about 5%.

37. the nonwoven web after contracting in footpath as claimed in claim 34 is characterized in that, it comprises the spunbond paper web after contracting in the footpath.

38. the nonwoven web after contracting in footpath as claimed in claim 34 is characterized in that, it comprises that the footpath melts and sprays paper web after contracting.

39. the nonwoven web after contracting in footpath as claimed in claim 34 is characterized in that, it comprise the footpath after contracting spunbond-melt and spray-spunbond paper web laminate.

40. the nonwoven web after contracting in footpath as claimed in claim 34 is characterized in that, first fiber has the first area percentage of fiber combining, and second fiber has the second area percentage of fiber combining, and second percentage is lower than first percentage.

41. the nonwoven web after contracting in footpath as claimed in claim 34 is characterized in that, first fiber has the fiber combining pattern of less restriction, and second fiber has the fiber combining pattern of more restriction.

42. the nonwoven web after contracting in footpath as claimed in claim 34 is characterized in that, the fiber in the central region has the first average denier, and the fiber in the fringe region has the second average denier, and the first average denier is less than the second average denier.

43. the nonwoven web after contracting in footpath as claimed in claim 34 is characterized in that, the fiber in the central region relatively more at random or transversal orientation, and the fiber in two fringe regions is more in the machine direction orientation.

44. the nonwoven web after contracting in footpath as claimed in claim 34, it is characterized in that, fiber in the central region has the first average length diameter ratio, and two interior fibers of fringe region have the second average length diameter ratio, and first average length diameter ratio is less than the second average length diameter ratio.

45. the nonwoven web after contracting in footpath as claimed in claim 34, it is characterized in that, fiber in the central region has the first average bulk density, and two interior fibers of fringe region have the second average bulk density, and the first average bulk density is less than the second average bulk density.

46. the nonwoven web after contracting in footpath as claimed in claim 34 is characterized in that, first fiber does not curl, and second fiber crimp.

47. the nonwoven web after contracting in footpath as claimed in claim 34 is characterized in that, first fiber has first component of polymer, and second fiber has second component of polymer different with first component of polymer.

48. the nonwoven web after contracting in footpath as claimed in claim 34 is characterized in that, the fiber in two fringe regions is more straight than the fiber in the central region.

49. a laminate, it comprises:

Nonwoven web after contracting in the footpath that comprises a central region and two fringe regions;

The central region of paper web comprises a plurality of first fibers;

Two fringe regions of paper web comprise a plurality of second fibers different with first fiber; With

Elasticity or extending film combine with the nonwoven web of footpath after contracting;

Wherein, the sheepshank laminate of closing in footpath comprises the central region with first basic weight and has to be first basic weight, two fringe regions of second basic weight in ± 7% approximately.

50. laminated product is closed in footpath as claimed in claim 49 sheepshank, it is characterized in that, it comprises the nonwoven web after contracting in two footpaths, and the nonwoven web after contracting in two footpaths of film and this combines.